1 Assistant professor, Samuel Bronfman Department of Medicine, Mount Sinai Hospital, New York, New York; horatio.holzer@mountsinai.org .
2 Professor, Department of Internal Medicine, Dell Medical School at the University of Texas, Austin, Austin, Texas.
3 Associate professor, Department of Medicine, University of California, San Francisco, San Francisco, California.
4 Assistant professor, Divisions of Pulmonary/Critical Care Medicine & Hospital Medicine, Department of Medicine, University of California, San Francisco, San Francisco, California.